What is one type of nystagmus associated with DUI testing?

Rotational nystagmus is associated with DUI testing because it occurs when an individual is under the influence of alcohol or other intoxicants that affect the vestibular system. This type of nystagmus can be observed when a person is spun in a circle and then has their head stopped suddenly; the eyes will continue to move as they try to regain a stable visual field. In the context of DUI evaluations, trained officers look for this response as an indicator of impairment.

One key aspect of rotational nystagmus is that it shows how the balance and coordination systems are affected by substances that alter motor function. This can provide critical evidence during field sobriety tests, helping officers assess cognitive and motor impairment due to intoxication.

In contrast to the other types mentioned, which may not be directly related to DUI testing, rotational nystagmus has a clear correlation with how substances can disrupt normal eye movements and coordination, making it a substantial indicator for law enforcement.